28910028 has 24 divisors (see below), whose sum is σ = 77093632. Its totient is φ = 8259984.

The previous prime is 28909981. The next prime is 28910041. The reversal of 28910028 is 82001982.

It is a junction number, because it is equal to n+sod(n) for n = 28909977 and 28910004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172000 + ... + 172167.

Almost surely, 2^28910028 is an apocalyptic number.

28910028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28910028 is an abundant number, since it is smaller than the sum of its proper divisors (48183604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28910028 is a wasteful number, since it uses less digits than its factorization.

28910028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344181 (or 344179 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28910028 is about 5376.8046272856. The cubic root of 28910028 is about 306.9136264209.

The spelling of 28910028 in words is "twenty-eight million, nine hundred ten thousand, twenty-eight".